Front element for push button Harmony ZB4. Cover made of chrome-plated metal. Front element, flat, round, without detent. Dimensions (WxHxD) 29x29x28 mm, mounting diameter 22 mm. Mechanical life 1,000,000 cycles. Head shape round, standard. With high vibration resistance and chemical resistance, ambient temperature -40 to +70 degrees C. The modular metal program with 22 mm installation dimension combines easy installation, efficiency and modern design. Certifications according to BV, GL, CSA, DNV, LROS (Lloyds register of shipping), RINA, UL listed. Product standards according to EN/IEC 60947-1, JIS C 4520, UL 508, EN/IEC 60947-5-1, EN/IEC 60947-5-4, CSA C22.2 No 14, EN/IEC 60947-5-5.